This is because the Son wishes to glorify the Father just as the Father wishes to glorify the Son. Look at John 17:1-5
 1After Jesus said this, he looked toward heaven and prayed: "Father, the time has come. Glorify your Son, that your Son may glorify you. 2For you granted him authority over all people that he might give eternal life to all those you have given him. 3Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent. 4I have brought you glory on earth by completing the work you gave me to do. 5And now, Father, glorify me in your presence with the glory I had with you before the world began.
The Father gives His Son glory so that His Son may give Him glory. Their love is unmatched and no doubt They love to glorify one another.
When God first announced His Son He said, " This is My beloved Son, in whom I am well pleased." This beloved is just one example of the Father giving Glory to His Son.
Thanks and God Bless friends.